GRINDING :

GRINDING Grinding is one of the most popular finishing processes.
This process is carried out with a grinding wheel made up of grits for removing materials from workpiece surface.

The problems in conventional grinding process: :

The problems in conventional grinding process: High heat generation
Introduction of tensile residual stress and micro-cracks occur
High level of surface quality can not be reached
Problems in hard materials.
Less tool life
Sometimes M.R.R. is not satisfactory.

Now… elimination of all those problems are required…but… :

Now… elimination of all those problems are required…but… HOW…???

Here comes the introduction of _ :

How it is done… :

How it is done… The cryogen like liquid nitrogen is applied onto the cutting point mostly in the form of jet. At low temperature (-196°C) of the cryogen, the temperature at the cutting zone is controlled more effectively than the other methods of applying cutting fluid.

Slide 9:

discussing in course of viewing the advantages… :

discussing in course of viewing the advantages… The cryogenic grinding lowers the thermal related problems
Reduced grinding forces
High M.R.R. can be achieved
Minimizing residual stress and micro-cracks
Retention of wheel grit sharpness (i.e. low rate of grit wear)
Surface finish, dimensional accuracy and tool life improved
Difficult-to-machine materials can also be machined
Moreover, use of liquid nitrogen as a grinding fluid facilitates clean and pollution free working environment

Cryo-grinding do have distinctive advantages over the conventional cooling processes, but… :

Cryo-grinding do have distinctive advantages over the conventional cooling processes, but… The application of the cryogen in the moist atmosphere may cause formation of ice and around the delivery nozzle and the piping system carrying the cryogen. This may result in the possible blockage of the liquid nitrogen delivery system.
Economic considerations should be solved

Hence we can conclude… :

Hence we can conclude… Cryo-grinding improves product quality by controlling thermal effects
Oxidation and surface burning are eliminated
Surface damage is absent
The surface roughness in cryo grinding is found to be greater than in conventional grinding
Reduction in forces and specific energy
The benefits of cryo-grinding are greater for harder materials and higher infeeds